Paper



Patented Apr. 14, 1942 PAPER Worthie W. Haynes, South Bend, Ind.

No Drawing. Application June 19, 1939, Serial No. 279,917

2 Claims.

This invention relates to improvements in P r.

This invention relates to paper suitable for use in the manufacture of lamp shades and for other purposes and has for its objects:

First, to produce a new and improved paper.

Second, to produce such a paper which has the property of being translucent and of being luminous.

Third, to provide such a paper which may be manufactured easily and inexpensively.

Fourth, to provide such a paper in which there is incorporated luminous material which is distributed through the sheet of paper and which will not rub off.

Fifth, to produce such a paper which has the properties of translucency and luminosity, making it particularly fitted for the production of lamp shades.

Other objects and advantages pertaining to details and economies will appear from the description to follow. The invention is defined in the claims.

In carrying out my invention, I make use of a suitable sheet of paper which in and of itself is not opaque and which is sufficiently translucent to permit transmission of light when used in a lamp shade or the like. The pulp content of the paper is not critical and it is possible to employ a great variety of papers provided they are translucent and capable of receiving the luminous material with which the paper is impregnated.

I impregnate this paper with a suitable luminous material. I prefer to use calcium or zinc sulphide because such materials have the proper luminescent properties. I may with these sulphides employ a small quantity of a radium salt.

The sulphide which is used and the radium salt, if it is to be used, are mixed with a suitable vehicle consisting of oil, gum, mineral spirits and a drying agent. The sulphide either with or without the radium salts in this vehicle is applied to the sheet of paper which is then passed between squeeze rollers which squeeze the paper and the luminous material in its vehicle so that the luminous material is distributed throughout the sheet of paper and is thoroughly incorporated therein. A layer of the material is not formed at the surface of the sheet since the squeeze roll eliminates any appreciable surface film and distributes the luminous material throughout the entire sheet.

In applying the luminous material, I control the amount thereof so that the sheet which was translucent before the material was impregnated, is still translucent. The amount of material that can be applied while retaining the translucency of the paper is determined by the translucency of the original paper and it will be apparent that the amount to be employed will vary somewhat. The final sheet is preferably translucent.

My new and improved paper is particularly suitable for use in lamp shades. It transmits the light from the lamp on which the shade is used and diffuses it and gives a highly desirable luminous glow. When the luminous material is applied in a suitable varnish or lacquer vehicle to the surface of the sheet, there is danger of losing the luminous material through chipping or rubbing so that the lamp shade made of this,

paper eventually loses its desirable properties. This material must be handled carefully in manufacture to avoid checking of the film which may result if the sheet is pleated or foliated as is common in the manufacture of shades. By distributing the luminous material throughout the entire sheet as I do, I eliminate these objections and a lamp shade made of my material will retain the desirable luminous properties until the paper is completely worn out. There is no danger of rubbing or chipping the luminous material from the sheet of paper.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A sheet of paper having distributed through the fibrous interstices thereof so as to thoroughly impregnate the same a luminous sulphide, the surfaces of said sheet being free from excessive amounts of the impregnating material, said sheet being translucent and having the property of being luminous.

2. A sheet of fibrous material having distributed through the fibrous interstices thereof so as to thoroughly impregnate the same a luminous material, the surfaces of said sheet being free from excessive amounts of the impregnating material, said sheet being translucent and having the property of being luminous.

woa'rmr: w. HAYNES. 

